Bug 22498: Rename variable for budgets loop for invoice adjustments

Bug 22498: Rename variable for budgets loop for invoice adjustments

To test:
1 - Try to add some adjustments to an invoice (receive shipments, create invoice, click 'finish receiving')
2 - Note the fund dropdown has only 'No fund'
3 - Apply patch
4 - Refresh page
5 - Note you can now select funds, hooray!

Signed-off-by: Janet McGowan <janet.mcgowan@ptfs-europe.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>